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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1695f47277f07df5eef42182873cd9729dfb8258d0444f0d76660f34a1334f27' 
  AND token = 'qiDod4H5hd6ARwgp7/1uq8sERImQEhJrPvsn18cjzig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}